Platen printing-press.



EFICEQ MAX ROCKSTROH, OF KLEIN SEDLITZ, NEAR PIRNA, GERMANY.

PLATEN PRINTING-PBESS.

Specification of Letters Patent.

Application filed January 26, 1914. Serial No. 814=,589.

To all whom it may concm Be it known that I, MAX RooKsTRoH,manufacturer, a subject of the King of SaXony, Germany, residing atKlein Sedlitz, near Pirna, Germany, have invented certain new and usefulImprovements in Platen Printing-Presses, of which the following is aspecification.

In certain platen printing presses the gripper on the platen is openedby a spring which is so arranged, that its tension increases as theplaten` approaches the bed. Consequently the tendency of the spring' toopen the gripper increases with the approach to the bed.

The object of the present invention is to obviate this disadvantage.

To this end I use a spring engaged at one end with the gripper and atthe other end with a double armed lever whereof the rocking movement inone direction is limited, said spring acting by a pull for closing thegripper by a thrust for opening same. With this arrangement thethickness of the paper does not afiect the power with which it is held,and the tension of the spring is greatest in the printing position, whenthe paper requires to be held most firmly.

The invention is illustrated in the accompanying drawings, in which-Figure 1 is a sectional side View, showing the gripper closed, and Fg. 2a plan view. Fig. 3 is a sectional side View showing the gripper open.

In the drawings a designates a coiled spring, having one end attached toan arm of the gripper bar b, and the other end attached to the arm c ofa double-armed lever d, the other arm of the latter being weighted orloaded with a spring. The gripper is designated e. The rocking movementof the lever d in one direction is limited by an abutment f on the armc. When the platen is rocked into printing position the spring a isstretched as shown in F igs. l and 2. When the platen rocks back, theweighted or spring loaded lever d, acting through the spring a andtending to compress same, opens the gripper, as shown in Fig. 3, butallows the grpper to be closed by hand,`inasmuch as the lever d is ableto rock.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed I declare thatwhat I claim is:-

In platen printing presses in combination with the gripper bar thereof,a spring having one end Secured to said gripper bar, a double armrocking lever, to one arm of which the other end of said spring issecured, and means for limiting the rocking movement of said rockinglever in one direction for allowing said spring to exert a pull forclosing the grpper and a thrust for opening the same, substantially asdescribed.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

MAX ROCKSTROH.

Witnesses LEO BERGHOLZ, PAUL ARRAs.

Gopies of this patent may be obtained for five cents each, by addresingthe Commissioner of Patents, Washington, D. C.

Patented May 4:, 1915.

